Foam and plunger intelligent combination gas lift device and method of use thereof

Abstract

The application discloses a foam and plunger intelligent combined gas lifting device and a use method thereof, and relates to the technical field of oil and gas extraction, in particular to an oil and gas extraction device and a use method thereof. The device comprises a downhole matching device, the downhole matching device is connected with an intelligent control device and a ground matching device, the intelligent control device is electrically connected with a ball throwing device and the ground matching device, the ball throwing device is communicated with the ground matching device, the downhole matching device is communicated with the ground matching device through the intelligent control device, and the downhole matching device is connected with the ground matching device through the intelligent control device. The fluid flowing out of the downhole matching device is directly discharged through the ground matching device, and the residual liquid is eliminated by the fluid flowing out of the downhole matching device through the intelligent control device to the ground matching device. The intelligent control device controls the foam displacement ball in the ball throwing device to be thrown into the downhole matching device, and the foam displacement ball reduces the surface tension of the liquid in the well after contacting the liquid. The downhole matching device, the ball throwing device and the intelligent control device are integrated into an oil and gas extraction process.

Description

Technical Field

[0001] This invention relates to the field of gas reservoir drainage and gas production technology, specifically to a gas lift device and its method of use that combines foam and plunger intelligently for drainage and gas production in oil wells. Background Technology

[0002] Natural gas accounts for a significant portion of my country's energy mix, and research on its extraction is crucial for both environmental and economic benefits. As gas wells are continuously exploited, gas production gradually decreases, while liquid production increases accordingly. When gas production exceeds the critical production level for water extraction, bottom-well fluid accumulation easily occurs. This bottom-well fluid acts on the formation, reducing formation pressure and damaging the gas reservoir, thus decreasing the effective permeability of the gas phase. In summary, bottom-well fluid accumulation leads to a decline in gas well production and even shutdown. Therefore, researching drainage gas production technologies is of great importance for ensuring stable gas well production.

[0003] Water drainage gas production is a common process in water-driven gas reservoir production, aiming to remove accumulated liquid from gas wells. Water drainage gas production processes include rod pumps, continuous gas lift, plunger gas lift, foam drainage, and optimized tubing string selection, among which plunger gas lift and foam drainage play crucial roles. Plunger gas lift relies on reservoir energy to carry liquid. During well shut-in, the annular pressure rises, and the plunger falls under gravity. After well opening, gas from the annulus enters the tubing, lifting the plunger and liquid to the wellhead. Foam drainage is a method of water drainage gas production that injects surfactants from the wellhead to the bottom of the well. These surfactants, upon contact with the liquid, reduce its surface tension, forming a low-density gas-liquid mixture to reduce gas slippage and lower the pressure drop gradient.

[0004] However, single drainage gas production methods have limitations in practice. For example, in low-yield gas lift, the shut-in time is long and residual liquid remains in the well after the plunger reaches the wellhead. In foam drainage gas production, after a solid foaming agent is added to the wellhead, the foaming agent cannot quickly fall into the depth of the wellbore under the action of gravity alone. Currently, there is no process that combines foam drainage with plunger gas lift to solve these problems. Summary of the Invention

[0005] The technical problem this invention aims to solve is the issue of residual liquid in gas or oil wells during gas extraction and the limited range of drainage and gas production devices in practice. This is because the gas production decreases after extraction, while the increased liquid production leads to excessive liquid accumulation at the bottom of the well, affecting gas production. Furthermore, existing technologies either use either a plunger-based gas lift method or a foam-based drainage method alone for drainage and gas production, without combining plunger-based gas lift and foam drainage. The purpose of this invention is to provide a gas lift device that intelligently combines foam and plunger technologies, along with its usage method, to solve the aforementioned problems.

[0006] This invention is achieved through the following technical solution:

[0007] A smart combination of foam and plunger in a gas lift device, comprising:

[0008] Downhole equipment, installed underground, is used to connect oil and gas in the well.

[0009] The surface-mounted auxiliary device is used to discharge the oil and gas from the downhole auxiliary device to the wellhead;

[0010] A ball-throwing device for temporarily storing or throwing volleyballs into the well;

[0011] The intelligent control device is used to control the opening and closing of the wellhead of the ground supporting equipment and to control the opening and closing of the ball-dropping device.

[0012] The intelligent control device is electrically connected to the ball-throwing device and the ground supporting device. The ball-throwing device is connected to the ground supporting device and leads to the downhole supporting device.

[0013] The downhole device has a casing, inside which is a tubing from the surface device. Inside the tubing is a plunger that slides in contact with the tubing. A buffer lock is fixed to the lower end of the tubing, and the upper end of the buffer lock has a plunger.

[0014] The oil pipe is connected to the air source pressure tapping line of the intelligent control device, and the main valve of the ground supporting device is installed on the oil pipe. A pressure gauge is located between the oil pipe and the air source pressure tapping line.

[0015] The intelligent control device includes a gas source pressure tapping pipeline, a separator pressure regulating valve, a controller, a diaphragm valve, and a bypass pipeline. The separator pressure regulating valve, the controller, and the diaphragm valve are sequentially connected from the oil pipe through the gas source pressure tapping pipeline, and the diaphragm valve is connected to the oil pipe through the bypass pipeline.

[0016] The arrival sensor is mounted on the outer wall of the catcher, and the catcher is mounted on the oil pipe.

[0017] A blowout preventer is installed at the top of the oil pipe.

[0018] The ball-throwing device includes a ball-adding pipe, a ball-collecting hopper, and a rotating ball valve, which are connected in sequence from top to bottom.

[0019] The rotary ball valve is connected to the tubing of the downhole equipment and is connected between the arrival sensor of the intelligent control device and the main valve of the surface equipment.

[0020] The intelligent control device has a controller electrically connected to the rotary ball valve of the ball-throwing device, and the controller is electrically connected to the diaphragm valve and the arrival sensor.

[0021] The rotary ball valve has an inlet, a valve body, and an outlet, with the valve body separating the inlet and outlet.

[0022] The ball valve body has a groove for accommodating the bubble ball.

[0023] Additionally, a method for using a gas lift device that intelligently combines foam and plunger is provided, comprising the following steps:

[0024] 1) Close the wellhead and add bubble balls into the ball collection hopper through the ball adding pipe;

[0025] 2) Determine the pressure in the tubing based on the pressure gauge reading. If the pressure gauge reading reaches the controller's set value, the controller will open the diaphragm valve by reducing the pressure of the gas source pressure tapping pipeline. At this time, the plunger in the tubing begins to gradually move upward to the wellhead, lifting the underground fluid from the bottom of the tubing to the wellhead through the plunger. The fluid then enters the production process from the tubing through the bypass pipeline at the wellhead.

[0026] 3) Before closing the wellhead, the controller decides whether to rotate the rotary ball valve to release the foam ball according to the release cycle of the foam ball. If it is released, the controller also needs to control the rotation of the rotary ball valve to make the foam ball fall into the tubing, close the wellhead, the plunger descends, and at the same time the formation fluid flows into the tubing.

[0027] 4) The plunger pushes the bubble ball in the oil pipe to the buffer stopper. The bubble ball gradually dissolves in the oil pipe, the surface tension of the fluid decreases, and the pressure in the oil pipe rises.

[0028] 5) Repeat steps 2) to 4) above, and finally close the wellhead without using this device.

[0029] When the rotating ball valve rotates, one bubble ball falls into the oil pipe with each 360° rotation. The controller controls the number of rotations of the rotating ball valve to determine the amount of bubble balls dispensed.

[0030] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0031] 1. The downhole supporting device of the present invention is installed underground. The downhole supporting device is connected to the oil and gas in the well. The oil and gas in the well are connected to the surface supporting device and the intelligent control device through the downhole supporting device. The intelligent control device is electrically connected to the ball-dropping device and the surface supporting device. The intelligent control device controls the opening and closing of the wellhead of the surface supporting device and the opening and closing of the ball-dropping device. After the intelligent control device opens the surface supporting device, the oil and gas flow out from the wellhead. The intelligent control device controls the ball-dropping device to make the bubble ball enter the downhole supporting device. Since the ball-dropping device is connected to the surface supporting device and connects to the surface supporting device, the oil and gas flow out from the wellhead. The intelligent control device controls the ball-dropping device to make the bubble ball enter the downhole supporting device. The downhole device allows the foam ball to enter the downhole device, closes the wellhead, and introduces oil and gas into the downhole device to pressurize it. Once the pressure reaches a certain level, the wellhead is opened. The downhole device of this invention is connected to the gas path of the surface device through an intelligent control device, allowing residual liquid in the downhole device to flow out as gas. After the wellhead is opened and the gas flows out, the foam ball can quickly fall into the depth of the downhole device. The downhole device of this invention integrates a ball dropping device and an intelligent control device, combining foam drainage and plunger gas lift intelligent gas production technology.

[0032] 2. The downhole device of the present invention has a casing, and the casing is fitted with the tubing of the surface device. The tubing has a plunger inside, and the plunger slides in contact with the tubing. A buffer lock is fixed to the lower end of the tubing. The upper end of the buffer lock has a plunger, and the buffer lock limits the downward movement of the plunger during its descent.

[0033] 3. The oil pipe of the present invention is connected to the gas source pressure tapping pipeline of the intelligent control device. The main valve of the ground supporting device is installed on the oil pipe. The oil pipe branches through the gas source pressure tapping pipeline. There is a pressure gauge between the oil pipe and the gas source pressure tapping pipeline. The reading of the pressure gauge determines whether to open the wellhead.

[0034] 4. In this invention, the separator pressure regulating valve, controller and diaphragm valve are sequentially connected from the oil pipe through the gas source pressure tapping pipeline. The diaphragm valve is connected to the oil pipe through the bypass pipeline so that the oil and gas entering the oil pipe are separated by the gas and liquid of the diaphragm valve. The branch of the oil pipe returns to the oil pipe with gas, while the residual liquid in the oil pipe remains on the diaphragm valve. Only the diaphragm valve needs to be replaced.

[0035] 5. The arrival sensor described in this invention is installed on the outer wall of the catcher to facilitate the detection of the upward position of the plunger.

[0036] 6. The upper end of the arrival sensor of the present invention is electrically connected to a catcher. The catcher is installed on the oil pipe. When the plunger moves up to the vicinity of the arrival sensor, the catcher is activated to prevent the plunger from falling.

[0037] 7. The uppermost end of the oil pipe described in this invention is equipped with a blowout preventer to prevent oil and gas from overflowing.

[0038] 8. The ball valve body of the rotary ball valve of the present invention separates the ball inlet and the ball outlet, and rotating the ball valve body can throw the bubble ball from the ball inlet to the ball outlet.

[0039] 9. The present invention combines foam and plunger lifting, which improves the effect and reliability of plunger operation. The surfactant minimizes gas slippage, which can improve the situation where the gas production is insufficient to remove residual liquid in the well after the plunger arrives, and is conducive to the development of drainage and gas production technology.

[0040] 10. The ball valve of this invention can accurately dispense one foaming ball every 360° rotation. The method of dispensing multiple balls is to control the ball valve to rotate multiple times, which can determine the number of foaming agents to be dispensed and prevent the phenomenon of balls getting stuck in the pipe due to the accumulation of foaming balls.

[0041] 11. In this invention, the plunger pushes the foam ball down to the bottom of the well. Compared with the single foam drainage and gas production method, this method increases the falling depth of the foam ball by utilizing existing devices, thereby enhancing the foam effect. The controller provides intelligent control, adjusting according to the working system of the plunger on the one hand, and controlling the rotation of the rotating ball valve on the other hand, so that the foam ball can reach the tubing without manual placement, reducing labor costs. Attached Figure Description

[0042] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0043] Figure 1 This is a schematic diagram of the structural connection of the present invention;

[0044] Figure 2 This is a schematic diagram of the internal structure of the ball valve of the present invention;

[0045] The attached diagram shows the markings and corresponding component names:

[0046] 1-Adding ball pipe, 2-Collecting ball bucket, 3-Bubble ball, 4-Ball valve, 5-Main valve, 6-Casing, 7-Oil pipe, 8-Plunger, 9-Buffer locking device, 10, 11-Pressure gauge, 12-Pressure signal transmission line, 13, 16-Gas source pressure tapping line, 14-Separator pressure regulating valve, 15-Controller, 17-Signal transmission line, 18-Diaphragm valve, 19-Blowout preventer, 20-Catcher, 21-Arrive sensor, 22-Bypass line, 23-First valve, 24-Second valve, 25-Ball inlet, 26-Ball valve body, 27-Ball outlet. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0048] Downhole equipment, installed underground, is used to connect oil and gas in the well.

[0049] A surface-mounted auxiliary device is used to discharge the oil and gas from the downhole auxiliary device to the wellhead.

[0050] A ball-throwing device for temporarily storing or throwing volleyballs into the well;

[0051] The intelligent control device is used to control the opening and closing of the wellhead of the surface supporting device, control the opening and closing of the ball dropping device, and control the gas path of the downhole supporting device to the surface supporting device through the intelligent control device.

[0052] The intelligent control device is electrically connected to the ball-throwing device and the ground supporting device. The ball-throwing device is connected to the ground supporting device and leads to the downhole supporting device.

[0053] Example 1

[0054] like Figure 1-2 As shown, this embodiment provides a gas lift device that intelligently combines foam and plunger. The downhole supporting device has a casing 6, and the casing 6 is fitted with an oil pipe 7 provided by the surface supporting device. The oil pipe 7 has a plunger 8 inside, which slides in contact with the oil pipe 7. A buffer lock 9 is fixed to the lower end of the oil pipe 7. The upper end of the buffer lock 9 has the plunger 8. The arrival sensor 21 is installed on the outer wall of the catcher 20. The lower end of the catcher 20 has the plunger 8.

[0055] The oil pipe 7 is connected to the air source pressure tapping line 13 of the intelligent control device. The oil pipe 7 branches off from the air source pressure tapping line 13. The main valve 5 of the ground supporting device is installed on the oil pipe 7. A pressure gauge 11 is located between the oil pipe 7 and the air source pressure tapping line 13. The intelligent control device includes the air source pressure tapping line 13, a separator pressure regulating valve 14, a controller 15, a diaphragm valve 18, and a bypass line 22. The separator pressure regulating valve 14, the controller 15, and the diaphragm valve 18 are sequentially connected from the oil pipe 7 through the air source pressure tapping line 13. The diaphragm valve 18 is connected to the oil pipe 7 through the bypass line 22.

[0056] The arrival sensor 21 is mounted on the outer wall of the catcher 20.

[0057] The upper end of the arrival sensor 21 is electrically connected to a catcher 20, which is installed on the oil pipe 7. The uppermost end of the oil pipe 7 is equipped with a blowout preventer 19.

[0058] The ball-throwing device includes a ball-adding pipe 1, a ball-collecting hopper 2, and a rotating ball valve 4. The ball-adding pipe 1 and the ball-collecting hopper 2 are used to replenish the number of bubble balls 3, provide storage space, and throw the bubble balls 3 into the well from the ball-collecting hopper 3. The ball-adding pipe 1, the ball-collecting hopper 2, and the rotating ball valve 4 are connected in sequence from top to bottom. The rotating ball valve 4 is connected to the oil pipe 7 of the downhole supporting device and is connected between the arrival sensor 21 of the intelligent control device and the main valve 5 of the surface supporting device.

[0059] The intelligent control device has a controller 15 electrically connected to the rotating ball valve 4 of the ball-throwing device, and a controller 13 connected to the diaphragm valve 18 and the arrival sensor 21.

[0060] The rotary ball valve 4 has a ball inlet 25, a ball valve body 26, and a ball outlet 27. The ball valve body 26 separates the ball inlet 25 and the ball outlet 27. The ball valve body 26 has a groove for accommodating the bubble ball 3. The groove places and guides the bubble ball 3.

[0061] The specific working principle of this invention is as follows:

[0062] The wellhead is the upper end of the blowout preventer 19, which is blocked by a threaded plug.

[0063] The controller 15 mainly plays a control role. The controller 15 controls the opening and closing of the diaphragm valve 18, controls the rotation of the rotary ball valve 4, and controls the signal reaching the sensor 21 to determine the opening and closing of the wellhead.

[0064] When the wellhead is closed, the plunger 8 in tubing 7 descends, and at the same time, oil, gas or fluid enters the lower end of tubing 7. The plunger 8 falls to the position of the buffer stopper 9 and is limited by the buffer stopper 9, and the pressure inside tubing 7 is internally suppressed.

[0065] When the wellhead is opened, the pressure inside the tubing 7 is released outside the wellhead. The main valve 5 opens, the first valve 23 opens, and the second valve 24 closes. The plunger 8 moves upward, lifting the oil and gas fluid and reaching the wellhead position. The sensor 21 transmits a signal to the controller 15, which then controls the catcher 20 to catch the plunger 8 and prevent it from falling. When the wellhead pressure drops to the set value, the controller 15 increases the pressure of the gas source pressure tapping line 16 and closes the diaphragm valve 18, thereby shutting down the well. Rotating the ball valve 4 releases the foam ball 3 deep into the tubing 7. The cycle of the foam ball 3 entering the well is an integer multiple of the cycle of the plunger 8's up and down movement. Near the end of the well opening phase, the controller 15 controls whether the ball valve 4 rotates according to the cycle of foam ball 3 release. If it doesn't rotate, it means no foam ball release is needed for this plunger 8's movement cycle. When rotating, each 360° rotation means one foam ball 3 falls into the wellhead. The controller 15 controls the number of rotations of the ball valve 4 to achieve different release quantities of foam balls 3. At this point, the foam ball has fallen into the tubing 7 while the plunger 8 has not yet fallen. After the well is shut in, because the plunger 8's falling speed is higher than that of the foam ball 3, the plunger 8 will eventually catch up with and push the foam ball 3 quickly to the buffer stopper 9, causing it to break. Compared to relying solely on the weight of the foam ball 3 to fall to a certain depth, the dissolved foam ball 3 at the buffer stopper 9 reduces the surface tension of the liquid.

[0066] Controller 15 controls the rotation of ball valve 4, such as Figure 2 As shown, whenever the wellhead is about to be closed, the controller 13 causes the rotating ball valve 4 to rotate. The rotating ball valve 4 rotates 360° once. Each rotation of the rotating ball valve 4 either puts the bubble ball 3 into the tubing 7 or puts the bubble ball 3 in the ball collection hopper 2 into the groove of the ball valve body 26 to prepare for the next insertion.

[0067] Since the ball valve body 26 is a ball, the bubble ball 3 entering from the inlet 25 needs to be rotated 360° before it enters the outlet 27.

[0068] The surfactant in Bubble Ball 3 is injected into the bottom of the well from the wellhead. After contacting the liquid, it reduces the surface tension of the liquid and forms a low-density gas-liquid mixture to reduce liquid slippage and lower the pressure drop gradient.

[0069] Therefore, the present invention is an integrated device for draining liquid from gas wells. It utilizes the advantages of plunger 8 and foam drainage technology and combines them to improve lifting efficiency, thereby optimizing the operation of plunger 8, and finally derives a gas production process technology of intelligent combination of foam and plunger gas lift.

[0070] Example 2

[0071] A method for using a smart combination of foam and plunger air lift device includes the following steps:

[0072] 1) Close the wellhead and add bubble balls 3 into the ball collection hopper 2 through the ball adding pipe 1;

[0073] 2) Determine the pressure in tubing 7 based on the reading of pressure gauge 11. If the reading of pressure gauge 11 exceeds the required pressure, open the wellhead. Controller 15 then opens diaphragm valve 18 by reducing the pressure of gas source pressure tapping line 16. At this time, plunger 8 in tubing 7 begins to gradually move upward to the wellhead, lifting the underground fluid from the bottom of the well to the wellhead through plunger 8.

[0074] 3) Before closing the wellhead, the controller 15 decides whether to rotate the rotating ball valve 4 to release the foam ball 3 according to the release cycle of the foam ball 3. If it is released, the controller 15 also needs to control the rotation of the rotating ball valve 4 to make the foam ball 3 fall into the tubing 7, close the wellhead, the plunger 8 moves downward, and fluid flows into the tubing 7 at the same time.

[0075] 4) The plunger 8 pushes the bubble ball 3 in the oil pipe 7 to the buffer lock 9. The bubble ball 3 gradually dissolves in the oil pipe 7, the surface tension of the fluid decreases, and the pressure in the oil pipe 7 rises.

[0076] 5) Repeat steps 2) to 4) above, and finally close the wellhead if the gas lift device is no longer in use.

[0077] The above description is merely a preferred embodiment of the present invention and is illustrative rather than restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A gas lift device that intelligently combines foam and plunger, characterized in that, include: Downhole equipment, installed underground, is used to connect oil and gas in the well. A surface-mounted auxiliary device is used to discharge the oil and gas from the downhole auxiliary device to the wellhead. A ball-throwing device for temporarily storing or throwing volleyballs into the well; The intelligent control device is used to control the opening and closing of the wellhead of the ground supporting equipment and to control the opening and closing of the ball dropping device; The intelligent control device is electrically connected to the ball-throwing device and the ground supporting device. The ball-throwing device is connected to the ground supporting device and leads to the downhole supporting device. The downhole device has a casing (6), and the casing (6) is fitted with an oil pipe (7) provided by the surface device. The oil pipe (7) has a plunger (8) inside, and the plunger (8) slides in contact with the oil pipe (7). A buffer lock (9) is fixed at the lower end of the oil pipe (7), and the upper end of the buffer lock (9) has a plunger (8). The oil pipe (7) is connected to the air source pressure tapping pipeline (13) of the intelligent control device. The main valve (5) of the ground supporting device is installed on the oil pipe (7). A pressure gauge (11) is provided between the oil pipe (7) and the air source pressure tapping pipeline (13). A blowout preventer (19) is installed at the uppermost end of the oil pipe (7). The intelligent control device includes a gas source pressure tapping pipeline (13) (16), a separator pressure regulating valve (14), a controller (15), a diaphragm valve (18), and a bypass pipeline (22). The separator pressure regulating valve (14), the controller (15), and the diaphragm valve (18) are sequentially connected from the oil pipe (7) through the gas source pressure tapping pipeline (13). The diaphragm valve (18) is connected to the oil pipe (7) through the bypass pipeline (22).

2. The air lift device with intelligent combination of foam and plunger according to claim 1, characterized in that: The bypass line (22) is connected to the oil pipe (7), and the sensor (21) is installed on the oil pipe (7).

3. The air lift device with intelligent combination of foam and plunger according to claim 2, characterized in that: The arrival sensor (21) is electrically connected to the controller (15) and installed on the outer wall of the catcher (20), which is connected to the oil pipe (7).

4. The air lift device with intelligent combination of foam and plunger according to claim 1, characterized in that: The ball-throwing device has a ball-adding pipe (1), a ball-collecting hopper (2), and a rotating ball valve (4), which are connected sequentially from top to bottom.

5. The air lift device with intelligent combination of foam and plunger according to claim 4, characterized in that: The rotary ball valve (4) is connected to the tubing (7) of the downhole equipment and is connected between the arrival sensor (21) of the intelligent control device and the main valve (5) of the surface equipment.

6. The air lift device with intelligent combination of foam and plunger according to claim 1, characterized in that: The intelligent control device has a controller (15) that is electrically connected to the rotary ball valve (4) of the ball throwing device via a signal transmission line (17). The controller (15) is electrically connected to the diaphragm valve (18) and the arrival sensor (21).

7. The air lift device with intelligent combination of foam and plunger according to claim 6, characterized in that: The rotary ball valve (4) has a ball inlet (25), a ball valve body (26), and a ball outlet (27), with the ball valve body (26) separating the ball inlet (25) and the ball outlet (27).

8. The air lift device of intelligent combination of foam and plunger according to claim 7, characterized in that: The ball valve body (26) has a groove for accommodating the bubble ball (3).

9. A method of using an air lift device that intelligently combines foam and plunger, characterized in that, Using the air lift device as described in any one of claims 1-8 includes the following steps: 1) Close the wellhead and add bubble balls (3) into the ball collection bucket (2) through the ball adding pipe (1); 2) Determine the pressure in the tubing (7) based on the reading of the pressure gauge (10). If the reading of the pressure gauge (10) reaches the set value of the controller (15), the controller (15) will open the diaphragm valve (18) by reducing the pressure of the gas source pressure tapping pipeline (16). At this time, the plunger (8) in the tubing (7) will gradually move up to the wellhead, and the underground fluid will be lifted from the bottom of the well to the wellhead through the plunger (8). The fluid will then enter the production process from the tubing (7) through the bypass pipeline (22) at the wellhead. 3) Before closing the wellhead, the controller (15) decides whether to rotate the rotating ball valve (4) to release the foam ball (3) according to the release cycle of the foam ball (3). If released, the controller (15) also needs to control the rotation of the rotating ball valve (4) to make the foam ball (3) fall into the tubing (7), close the wellhead, and the plunger (8) moves downward. At the same time, the formation fluid flows into the tubing. 4) The plunger (8) pushes the bubble ball (3) in the oil pipe (7) to the buffer clamp (9). The bubble ball (3) gradually dissolves in the oil pipe (7), the surface tension of the fluid decreases, and the pressure in the oil pipe (7) rises. 5) Repeat steps 2) to 4) above, and finally close the wellhead if the gas lift device is not used.

10. The method of using the air lift device of the intelligent combination of foam and plunger according to claim 9, characterized in that, When the rotating ball valve (4) rotates, one bubble ball (3) falls into the oil pipe (7) each time it rotates 360°. The controller (15) controls the number of rotations of the rotating ball valve (4) to realize the amount of bubble balls (3) dispensed.

Images